Across
- 4. Water covers more than 70% of the ... of the Earth.
- 6. Every scientist dreams about making a ... .
- 8. All the planets of our solar system ... around the Sun.
- 11. It's a gas that we need to breathe.
- 12. Electric cars need power, while usual cars require to be filled in with .. .
- 13. To convert waste into a material that can be used again.
Down
- 1. It's an ecological problem that happens when people cut off trees.
- 2. To ... means "to create something new".
- 3. When you leave the room,... off the lights, please.
- 5. A road on which cars drive
- 7. My electric car battery has run out! I need to .. it.
- 9. Harmful ... from factories pollute the air.
- 10. Engineers ... different problems that people have.